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                铺地板                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div align="left">&nbsp;</div>
<div><span style="font-size: 15pt">&nbsp;&nbsp;&nbsp;</span></div>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; text-indent: 21pt"><span style="font-size: 15pt; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">俄罗斯方块是一款风靡全球的电视游戏机和掌上游戏机游戏，它由俄罗斯人阿列克谢</span><span lang="EN-US" style="font-size: 15pt"><font face="Calibri">&middot;</font></span><span style="font-size: 15pt; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">帕基特诺夫发明，故得此名。俄罗斯方块的基本规则是移动、旋转和摆放游戏自动输出的各种方块，使之排列成完整的一行或多行并且消除得分。由于上手简单、老少皆宜，从而家喻户晓，风靡世界。</span><span lang="EN-US" style="font-size: 15pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt"><span lang="EN-US" style="font-size: 15pt"><span style="mso-tab-count: 1"><font face="Calibri">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </font></span></span><span style="font-size: 15pt; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">俄罗斯方块共有以下七种，这些方块可以旋转但不能翻转。</span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt"></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt"><span style="font-size: 15pt; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri"><img height="136" alt="" width="276" src="../file/3222_0.jpg" /></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt"><span lang="EN-US" style="font-size: 15pt"><span style="mso-tab-count: 1"><font face="Calibri">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </font></span></span><span style="font-size: 15pt; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">现在小</span><span lang="EN-US" style="font-size: 15pt"><font face="Calibri">N</font></span><span style="font-size: 15pt; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">家中刚好要装修客厅，他希望使用俄罗斯方块来铺地板。小</span><span lang="EN-US" style="font-size: 15pt"><font face="Calibri">N</font></span><span style="font-size: 15pt; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">家的地板大小为</span><span lang="EN-US" style="font-size: 15pt"><font face="Calibri">n*m</font></span><span style="font-size: 15pt; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">。他想知道他共有多少种铺地板的方法。要求这些俄罗斯方块不能重叠，且要将地板刚好铺满。</span><span lang="EN-US" style="font-size: 15pt"><o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="margin: 0cm 0cm 0pt; text-align: left"><span style="font-size: 15pt; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">另外在小</span><span lang="EN-US" style="font-size: 15pt"><font face="Calibri">N</font></span><span style="font-size: 15pt; font-family: 宋体; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri">家的客厅中还有一些柱子，显然在柱子底下是不能铺地板的。</span><span lang="EN-US" style="font-size: 15pt"><o:p></o:p></span></p>
<p></p></p><hr/><h3>输入格式</h3><p><p><font size="5">&nbsp;&nbsp; </font><span style="font-size: 15pt">第一行三个整数</span><span style="font-size: 15pt">n,m,k</span><span style="font-size: 15pt">表示客厅长度、宽度和柱子数量。</span><span style="font-size: 15pt">之后的</span><span style="font-size: 15pt">k</span><span style="font-size: 15pt">行，每行两个整数</span><span style="font-size: 15pt">x,y(0&lt;=x&lt;n,0&lt;=y&lt;m)</span><span style="font-size: 15pt">，表示柱子在第</span><span style="font-size: 15pt">x</span><span style="font-size: 15pt">行第</span><span style="font-size: 15pt">y</span><span style="font-size: 15pt">列。</span></p></p><hr/><h3>输出格式</h3><p><p>&nbsp;<span style="font-size: 15pt">&nbsp;</span><span style="font-size: 15pt">输出一个整数，表示方案数</span><span style="font-size: 15pt">mod (10^9+7)</span><span style="font-size: 15pt">的值</span></p></p><hr/><h3>样例输入</h3><pre>      3 3 1
      1 1
</pre><hr/><h3>样例输出</h3><pre>      4
</pre><hr/><h3>提示</h3><p><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 对于100%的数据，k&lt;=n*m,N&lt;=30,M&lt;=7</p></p><hr/><h3>题目来源</h3><p>插头Dp</p>
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